JP2008078181A - Organic el light emitting material and method of manufacturing organic el device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an organic EL light emitting material which can improve light emitting characteristics, as well as a method of manufacturing an organic EL device. <P>SOLUTION: This method is used to manufacture an organic EL device 100 which includes organic light emitting layers 18a, 18b and 18c between an anode 11 and a cathode 19. It includes a step to form organic light emitting layers 18a, 18b and 18c by forming a film through the drop discharging method by using an organic EL light emitting material that has a phosphorescent light emitting material as a solute and is made of a compound including an organic solvent with two or more circular structures as a solvent, wherein at least one thereof is a benzene ring, or that has an organic solvent made of a condensed ring compound with at least one benzene ring structure. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an organic EL light emitting material and a method for manufacturing an organic EL device.

  As a spontaneous emission type display, development of an organic electroluminescence element (hereinafter referred to as an organic EL element) using an organic substance in a light emitting layer is underway. An organic EL element has a structure in which a thin film made of an organic material is sandwiched between an anode and a cathode, and emits light by recombining carriers injected from two electrodes in the organic thin film.

  An organic EL device including a large number of such organic EL elements has features such as being thin and light. Also, if coating and film formation are performed by a liquid phase method typified by the ink jet method, an organic thin film can be uniformly formed over a wide range, and therefore, application to a large flat panel display is expected. Yes.

In recent years, a technique for forming a light emitting layer by using an ink material containing a low molecular weight organic light emitting material in a hydrophobic organic solvent and applying the ink material by a wet patterning method has been proposed ( For example, see Patent Document 1).
Japanese Patent Application Laid-Open No. 2001-291587

  However, in the ink material using the hydrophobic organic solvent as described above, the light emitting characteristics of the obtained organic EL element are not sufficiently good, and further improvement is desired.

  This invention is made | formed in view of the said situation, The place made into the objective is to provide the manufacturing method of the organic electroluminescent light emitting material which uses this, and the organic electroluminescent luminescent material which makes a luminescent property better.

  In order to achieve the above object, the organic EL light-emitting material of the present invention is a light-emitting material for an organic EL device, which has a phosphorescent light-emitting material as a solute and two or more cyclic structures as a solvent. It is characterized by comprising an organic solvent composed of a compound in which at least one is a benzene ring or an organic solvent composed of a condensed ring system compound having at least one benzene ring structure.

  According to this organic EL light emitting material, since it has a phosphorescent light emitting material as a solute, it has better light emitting characteristics than a general fluorescent light emitting material. In addition, phosphorescent light-emitting materials are particularly deteriorated by water, but are made of an organic solvent having higher hydrophobicity, that is, a compound having two or more cyclic structures and at least one of the cyclic structures being a benzene ring. Since an organic solvent or an organic solvent composed of a condensed ring system compound having at least one benzene ring structure is used, characteristic deterioration due to water can be reliably suppressed. Therefore, it is possible to improve the light emission characteristics of the obtained organic EL element.

The method for producing an organic EL device of the present invention is a method for producing an organic EL device having an organic light emitting layer between an anode and a cathode.
An organic solvent comprising a compound having two or more cyclic structures as a solvent and at least one of the cyclic structures being a benzene ring, or a condensed ring system having at least one benzene ring structure And a step of forming an organic light emitting layer by forming a film of an organic EL light emitting material having an organic solvent made of a compound by a droplet discharge method.

  According to this method for manufacturing an organic EL device, as the organic EL light emitting material, a material that has good light emission characteristics as described above and in which deterioration of characteristics due to water is reliably suppressed is used. Since the organic light emitting layer is formed by forming a film by the droplet discharge method, the light emitting characteristics of the obtained organic EL device can be further improved.

  Further, in the method of manufacturing the organic EL device, the method includes a step of forming a hole injection / transport layer between the anode and the organic light emitting layer, and the step of forming the hole injection / transport layer includes a crosslinkable material. Is dissolved in an organic solvent comprising a compound having two or more cyclic structures and at least one of the cyclic structures being a benzene ring, or an organic solvent comprising a condensed ring system compound having at least one benzene ring structure. It is preferable to form a hole injecting and transporting layer by forming a solution.

  In this case, the solution used as the material for forming the hole injecting and transporting layer also has a more hydrophobic organic solvent, that is, two or more cyclic structures, and at least one of the cyclic structures is a benzene ring. Since an organic solvent made of a compound or an organic solvent made of a condensed ring system compound having at least one benzene ring structure is used, the hole injecting and transporting layer made of this solution is a light emitting layer formed thereon. The characteristic deterioration caused by water is surely suppressed. Therefore, the light emission characteristics of the obtained organic EL device can be improved.

  The present invention will be described in detail below.

  The organic EL light-emitting material of the present invention is a light-emitting material for an organic EL element (organic EL device), and is particularly used for film formation by a liquid phase method such as a droplet discharge method typified by an ink jet method. It is. This luminescent material is a solution having a phosphorescent luminescent material as a film-forming component (solute) and an organic solvent for dissolving the film-forming component.

In this embodiment, the film-forming component is composed of a phosphorescent material as a guest material and a host material. Specifically, “Tris (4-phenylpiridinolato) Ir (III)” (hereinafter referred to as Ir (ppy) ₃ ), which is a phosphorescent material, and “4,4-dicarbazole-4,4-biphenyl” (hereinafter referred to as “Ir (ppy) ₃ ”). And CBP) are preferably used. Here, among these compounds, Ir (ppy) ₃ ) as a guest material has a structure shown below.

また、ホスト材料となるＣＢＰは、以下に示す構造を有している。

Moreover, CBP used as a host material has the structure shown below.

なお、ホスト材料としては、前記ＣＢＰに限定されることなく種々のものが使用可能であるが、特に分子量が５０００以下の低分子系の材料が好適に用いられる。

As the host material, various materials can be used without being limited to the CBP. Particularly, a low molecular material having a molecular weight of 5000 or less is preferably used.

  In addition, as an organic solvent for dissolving such a film-forming component, an organic solvent composed of a compound having two or more cyclic structures and at least one of the cyclic structures being a benzene ring, or at least one benzene ring structure is used. An organic solvent made of a condensed ring system compound having one is used. Specific examples include cyclohexylbenzene, 3-isopropylbiphenyl, 3-methylbiphenyl, 4-methylbiphenyl, 1-methylnaphthalene, or derivatives thereof. These may be used alone or as a mixture. Can do.

  The concentration of the solute (film forming component) with respect to such an organic solvent is not particularly limited, and is prepared so as to have a viscosity suitable for coating, and further advantageous for drying and film formation. As appropriate. For example, when the ink is ejected and applied by an ink jet method, the concentration of the solute that is a solid content is adjusted to about 1% by weight.

  The organic EL light-emitting material of the present invention can be applied not only to a droplet discharge method such as an ink jet method but also to a film forming method using another liquid phase method such as a spin coating method.

  Since the organic EL light-emitting material thus prepared has a phosphorescent light-emitting material as a solute, the organic EL light-emitting material has better light emission characteristics than a general fluorescent light-emitting material. In addition, phosphorescent light-emitting materials are particularly deteriorated by water, but are made of an organic solvent having higher hydrophobicity, that is, a compound having two or more cyclic structures and at least one of the cyclic structures being a benzene ring. Since an organic solvent or an organic solvent composed of a condensed ring system compound having at least one benzene ring structure is used, characteristic deterioration due to water is reliably suppressed.

  Next, an embodiment of a method for manufacturing an organic EL device using such an organic EL light emitting material will be described.

  The manufacturing method of the present embodiment includes a partition wall forming step, a plasma treatment step, a hole injection transport layer forming step, a surface modification step, a light emitting layer forming step, a cathode forming step, and a sealing step. Configured.

  As shown in FIG. 1, in the partition forming step, an inorganic material is formed on a transparent electrode (anode) 11 made of ITO or the like formed on a substrate 10 on which a TFT or the like (not shown) is provided in advance. The first barrier ribs 12a made of the above and the second barrier ribs 12b made of the organic material are sequentially stacked to form the barrier ribs 12 separating the pixel regions.

The first partition 12a is formed by forming an inorganic film (not shown) made of an inorganic material such as SiO ₂ or SiN on the entire surface of the substrate 10 and the transparent electrode 11 by, for example, CVD, sputtering, vapor deposition, or the like. The inorganic film is formed by patterning by etching or the like to provide an opening 13 a in the pixel region on the transparent electrode 11. However, at this time, the first partition 12 a is left up to the peripheral edge of the transparent electrode 11.

  Next, an organic film (not shown) made of an organic material is formed on the entire surface of the substrate 10, the transparent electrode 11, and the first partition 12a. This organic film is formed by applying an organic resin such as acrylic resin or polyimide resin dissolved in a solvent by spin coating, dip coating, or the like. Then, this organic film is etched by a photolithography technique or the like to form the opening 13b, thereby forming the second partition 12b. As shown in FIG. 1, the opening 13b of the second partition 12b is preferably formed slightly wider than the opening 13a of the first partition 12a. Thereby, an opening 13 is formed on the transparent electrode 11 so as to penetrate the first partition 12a and the second partition 12b. The planar shape of the opening 13 may be any of a circle, an ellipse, a square, and a stripe. However, since the ink material has a surface tension, in the case of a quadrangle, the corner is rounded. Is preferred.

  Next, in the plasma treatment step, a region showing ink affinity and a region showing ink repellency are formed on the surface of the partition wall 12. This plasma treatment step is roughly divided into a preliminary heating step, an ink repellent step for making the entire surface ink-philic, an ink repellent step for making the second partition wall 12b ink repellent, and a cooling step.

  In the preheating step, the substrate 10 including the partition walls 12 is heated to a predetermined temperature. The heating is performed, for example, by attaching a heater to a stage on which the substrate 10 is placed in the plasma processing chamber, and heating the substrate 10 together with the stage to 70 to 80 ° C., for example. By performing the preheating, the plasma processing conditions immediately after the start of the processing and immediately before the end of the processing can be made substantially constant even when the plasma processing is continuously performed on a large number of substrates. Thereby, the affinity with respect to the ink material of the partition wall 12 between the substrates 10 can be made uniform, and a display device having a certain quality can be manufactured. Further, by preheating the substrate 10 in advance, the processing time in the subsequent plasma processing can be shortened.

In the ink-philic step, plasma treatment (O ₂ plasma treatment) using oxygen as a reactive gas is performed in an air atmosphere. Specifically, the substrate 10 including the partition wall 12 is placed on a sample stage with a built-in heater, and this is irradiated with oxygen in a plasma state. The conditions for the O ₂ plasma treatment are, for example, a plasma power of 100 to 800 kW, an oxygen gas flow rate of 50 to 100 cc / min, a substrate transfer speed of 0.5 to 10 mm / sec, and a substrate temperature of 70 to 90 ° C. By this O ₂ plasma treatment, hydroxyl groups are introduced to the exposed surfaces of the transparent electrode 11 and the first partition 12a and the entire surface of the second partition 12b, thereby imparting ink affinity.

Next, in the ink repellent step, plasma treatment (CF ₄ plasma treatment) using tetrafluoromethane (carbon tetrafluoride) as a reactive gas is performed in an air atmosphere. Specifically, the substrate 10 including the partition wall 12 is placed on a sample stage with a built-in heater, and this is irradiated with plasma tetrafluoromethane (carbon tetrafluoride). The conditions of the CF ₄ plasma treatment are, for example, the conditions of plasma power of 100 to 800 kW, tetrafluoromethane (carbon tetrafluoride) gas flow rate of 50 to 100 SCCM, substrate transfer speed of 0.5 to 10 mm / sec, and substrate temperature of 70 to 90 ° C. Done in The processing gas is not limited to tetrafluoromethane (carbon tetrafluoride), and other fluorocarbon gases can be used. By the CF ₄ plasma treatment, a fluorine group is introduced into the second partition wall 12b to which ink affinity has been imparted in the previous step, and ink repellency is imparted. Organic substances such as an acrylic resin and a polyimide resin constituting the second partition wall 12b can be easily made ink-repellent by irradiating plasma fluorocarbon with hydroxyl groups replaced with fluorine groups. On the other hand, the exposed surfaces of the transparent electrode 11 and the first partition wall 12a are also somewhat affected by the CF ₄ plasma treatment, but the affinity is hardly affected.

  Next, as a cooling step, the substrate 10 heated for plasma processing is cooled to room temperature. Specifically, for example, the plasma-treated substrate 10 is placed on a water cooling plate and cooled. By cooling the substrate 10 after the plasma treatment to room temperature or a predetermined temperature (for example, a control temperature for performing the ink jet process), the next hole injection transport layer forming process can be performed at a constant temperature. Accordingly, when the solution containing the film forming component of the hole injection / transport layer is ejected by the ink jet method, the droplets can be ejected continuously at a constant volume, and the hole injection / transport layer is uniformly formed. be able to.

In the plasma processing step, an O ₂ plasma treatment and a CF ₄ plasma treatment are sequentially performed on the second partition 12a and the first partition 12b, which are made of different materials, so that an ink-philic region and an ink repellent property are applied to the partition 12. Can be easily provided.

  Next, in the hole injecting and transporting layer forming step, as shown in FIG. 2, a solution (ink material) 15 containing a film forming component of the hole injecting and transporting layer is ejected to the opening 13 on the transparent electrode 11 by an ink jet method. After that, drying treatment and heat treatment are performed to form the hole injection transport layer 16. In addition, after this positive hole injection transport layer formation process, it is preferable to carry out in inert gas atmospheres, such as a nitrogen atmosphere and argon atmosphere without a water | moisture content and oxygen. As shown in FIG. 2, the inkjet head 14 is filled with the solution (ink material) 15, the discharge nozzle of the inkjet head 14 is opposed to the opening 13, and the inkjet head 14 and the substrate 10 are relatively moved. A solution 15 in which the amount of liquid per droplet is controlled is ejected from the inkjet head 14 onto the transparent electrode 11.

  As the solution 15 used here, a solution composed of a crosslinkable material as a film forming component of the hole injecting and transporting layer and an organic solvent for dissolving it is preferably used. The crosslinkable material means a material containing a crosslinking agent having a function of crosslinking a polymer or the like by ultraviolet irradiation, electron beam irradiation, plasma irradiation, or heating. Also, many are proposed by ultraviolet irradiation and heating, and these can be used.

  As an example of the ultraviolet irradiation, a tetraaryldiamine compound is disclosed in, for example, Japanese Patent Application Laid-Open No. 5-271166, and is cured by ultraviolet irradiation to form a film. As an example of heating, a polysiloxane resin is disclosed in, for example, Japanese Patent Application Laid-Open No. 9-124943, and is cured by heat treatment to form a film.

  As an organic solvent for dissolving the crosslinkable material, in particular, an organic solvent composed of a compound having two or more cyclic structures and at least one of the cyclic structures being a benzene ring, or at least one benzene ring structure. An organic solvent composed of a condensed ring compound is preferably used. Specifically, cyclohexylbenzene, 3-isopropylbiphenyl, 3-methylbiphenyl, 4-methylbiphenyl, 1-methylnaphthalene used in the organic EL light-emitting material described above is used. These derivatives or the like are used alone or as a mixture.

  Such a solution 15 is discharged from the inkjet head 14 as described above, and is disposed in the opening 13. Then, the discharged solution 15 spreads over the transparent electrode 11 and the first partition wall 12a that have been subjected to the ink-philic treatment in the opening 13. Even if the solution 15 deviates from the predetermined discharge position and is discharged onto the second partition wall 12 b, the second partition wall 12 b does not get wet with the solution 15, and the repelled solution 15 rolls into the opening 13.

  The discharge amount of the solution 15 is determined by the size of the opening 13, the thickness of the hole injection / transport layer to be formed, the concentration of the film forming component of the hole injection / transport layer in the solution 15, and the like. Further, the solution 15 may be discharged not only once but also into the same opening 13 in several times. In this case, the amount of the solution 15 at each time may be the same, and the ink amount may be changed every time. Further, the solution 15 may be discharged not only to the same location in the same opening 13 but also to a different location in the opening 13 each time.

  Next, as shown in FIG. 3, the hole injection transport layer 16 is formed by drying the discharged solution 15 to evaporate the organic solvent contained in the solution 15. As this drying process, for example, a vacuum drying process at room temperature is employed. Subsequently, as the crosslinking curing treatment, for example, in the ultraviolet curing type such as a tetraaryldiamine compound, the hole injecting and transporting layer 16 is cured by a UV irradiation treatment with a mercury xenon lamp in a vacuum and insolubilized by a crosslinking reaction. To do. In addition, in a thermosetting type such as a polysiloxane resin, the hole injecting and transporting layer 16 is hardened and insolubilized by a cross-linking reaction by heating and heating at 180 ° C. for about 10 minutes in nitrogen.

  In such a hole injecting and transporting layer forming step, the discharged solution 15 is adapted to the exposed surface portions of the ink-philic transparent electrode 11 and the first partition 12a, while the ink repellent second partition 12b is Since it hardly adheres, even if the solution 15 is accidentally ejected onto the second partition 12b, the solution 15 is repelled and rolls onto the exposed surface portions of the transparent electrode 11 and the first partition 12a. Thereby, the hole injection transport layer 16 can be reliably formed on the transparent pixel electrode 11.

  As described above, a solution obtained by dissolving a crosslinkable material in an organic solvent is cured, and the obtained film (hole injection transport layer 16) is basically insolubilized by a crosslinking reaction. In this film, there is a possibility that an unreacted portion that has not been insolubilized remains because the crosslinking reaction does not proceed. If an unreacted portion remains in the hole injection transport layer 16, the unreacted portion is re-dissolved when the light emitting layer is formed, and the constituent components of the hole injection transport layer 16 and the light emitting layer are changed. As a result, the hole injection / transport layer 16 and the light emitting layer may be deteriorated in characteristics.

  Therefore, when the hole injecting and transporting layer 16 is formed from a crosslinkable material using an organic solvent, the crosslinkable material (hole injecting and transporting layer 16) cured and insolubilized by heat treatment is further rinsed with an organic solvent. The film after treatment may be used as the hole injection transport layer 16. As the organic solvent used for the rinsing treatment, a material for forming the light emitting layer, that is, an organic solvent used for the organic EL light emitting material described above is preferably used. Thus, if the hole injection transport layer 16 is rinsed using the organic solvent in the organic EL light emitting material, there is no possibility that the hole injection transport layer 16 is re-dissolved in the light emitting layer forming step described later. Because.

  Next, in the light emitting layer forming step, the organic EL light emitting material 17 of the present invention described above is used as an ink material, and is ejected onto the hole injecting and transporting layer 16 as shown in FIG. 4 by an ink jet method. As the light emitting material for forming the light emitting layer, the light emitting material of the present invention is used for all materials (ink materials) corresponding to each color of red (R), green (G), and blue (B). In addition, as for one or two of these, a conventionally used light emitting material, for example, a fluorescent light emitting material (fluorescent material) can be used.

  Examples of such fluorescent materials include fluorene polymer derivatives, (poly) paraphenylene vinylene derivatives, polyphenylene derivatives, polyfluorene derivatives, polyvinylcarbazole, polythiophene derivatives, perylene dyes, coumarin dyes, rhodamine dyes, and the like. Can be used.

  Then, after these organic EL light emitting materials 17 are discharged onto the hole injecting and transporting layer 16, each of the light emitting materials is subjected to a drying treatment and further a thermosetting treatment, so that a light emitting layer (organic light emitting layer) is formed as shown in FIG. ) 18a, 18b, and 18c are sequentially formed. Here, with respect to the drying treatment, vacuum drying at room temperature is preferably employed particularly when the above-described organic EL light emitting material of the present invention is used as the light emitting material. Moreover, about a thermosetting process, the heat processing for about 30 minutes at 90 degreeC in nitrogen atmosphere are employ | adopted suitably.

  When the light emitting layers 18a, 18b, and 18c are formed in this manner, the hole injection layer 16 is formed using a more hydrophobic organic solvent, particularly in the light emitting layer using the organic EL light emitting material of the present embodiment. Furthermore, since the light emitting layer itself is formed using an organic solvent having high hydrophobicity, the characteristic deterioration caused by water is surely prevented even though the phosphorescent light emitting material has a remarkable characteristic deterioration caused by water. It will be suppressed.

  Next, in the cathode forming step, as shown in FIG. 6, the cathode 19 is formed on the entire surface of the light emitting layers 18a, 18b, 18c and the second partition 12b. The cathode 19 may be formed by stacking a plurality of materials. For example, it is preferable to use a material having a low work function on the side close to the light emitting layer, and for example, Ca, Ba, or the like can be used. Also, the upper side (sealing side) preferably has a higher work function than the lower side (light emitting layer side) cathode layer, and is preferably made of, for example, an Al film, an Ag film, a Mg / Ag laminated film, or the like. In this embodiment, an aluminum quinolinol complex (Alq3) and LiF are stacked as a hole blocking layer and an electron transporting layer on the light emitting layers 18a, 18b, and 18c, and further Al is stacked thereon, whereby a hole blocking layer / electron is stacked. A cathode 19 made of a laminate film of a transport layer / cathode layer was formed.

These cathodes (cathode layers) are preferably formed by, for example, a vapor deposition method, a sputtering method, a CVD method, or the like. Particularly, the vapor deposition method can prevent the light emitting layers 18a, 18b, and 18c from being damaged by heat. Is preferable. Further, a protective layer such as SiO, SiO ₂ or SiN may be provided on the cathode 19 to prevent oxidation.

  Finally, in the sealing step, a sealing material made of a thermosetting resin or an ultraviolet curable resin is applied to the entire surface of the cathode 19 to form the sealing layer 20. Further, a sealing glass (not shown) is laminated on the sealing layer 20. The sealing step is preferably performed in an inert gas atmosphere such as nitrogen, argon, or helium. If it is carried out in the air, when a defect such as a pinhole has occurred in the reflective layer, water, oxygen or the like may enter the cathode 19 from the defective portion and the cathode 19 may be oxidized, which is not preferable. In this way, an organic EL device 100 as shown in FIG. 6 is obtained.

  In such a manufacturing method of the organic EL device 100, since the organic EL light emitting material of the present invention having a phosphorescent light emitting material is used as a material for forming the light emitting layer, the light emitting characteristics of the organic EL device 100 obtained are obtained. Can be better.

  Further, as described above, the hole injection layer 16 is formed using a more hydrophobic organic solvent, and the light emitting layers 18a, 18b, and 18c are also formed using a higher hydrophobic organic solvent. In spite of having a phosphorescent light emitting material in which the characteristic deterioration due to is remarkable, the characteristic deterioration caused by water can be reliably suppressed. Therefore, the light emission characteristics of the obtained organic EL device 100 can be improved.

(Experimental example)
As a material for forming the hole injecting and transporting layer 16, a solution 15 in which a tetraaryldiamine compound (Experimental product 1) or a polysiloxane resin (Experimental product 2) was dissolved in cyclohexylbenzene was used. Further, as a material for forming the light emitting layer 18, an organic EL light emitting material in which the above-mentioned Ir (ppy) ₃ was used as a guest material and a film forming component using CBP as a host material was dissolved in cyclohexylbenzene was used. Otherwise, the organic EL device as the product of the present invention was fabricated in substantially the same manner as in the manufacturing method described above.

  Further, as the comparative product 1, a material in which the organic solvent (cyclohexylbenzene) in the material for forming the hole injecting and transporting layer 16 was replaced with cyclohexanone was used. Other than this, an organic EL device as a comparative product 1 was produced in the same manner as the organic EL device as the product of the present invention described above.

  Further, as Comparative Product 2, a material obtained by replacing the organic solvent (cyclohexylbenzene) in the material for forming the light emitting layer 18 with cyclohexanone was used. Other than this, an organic EL device as a comparative product 2 was produced in the same manner as the organic EL device as the product of the present invention described above.

  Each of the organic EL devices thus produced was allowed to emit light, and the light emission lifetime at a constant current was examined. As a result, the organic EL devices of the present invention had substantially the same light emission lifetime in both experimental examples 1 and 2. Further, assuming that the emission lifetime of these organic EL devices of the present invention is 1, the emission lifetime of Comparative Example 1 is only 2/3, and the emission lifetime of Comparative Example 2 is only ½.

  Next, a specific example of an electronic apparatus including the organic EL device 100 as a display unit will be described. FIG. 7A is a perspective view showing an example of a mobile phone. In FIG. 7A, reference numeral 600 indicates a mobile phone body, and reference numeral 601 indicates the organic EL device as a display unit. FIG. 7B is a perspective view illustrating an example of a portable information processing apparatus such as a word processor or a personal computer. In FIG. 7B, reference numeral 700 denotes an information processing apparatus, reference numeral 701 denotes an input unit such as a keyboard, reference numeral 703 denotes an information processing apparatus body, and reference numeral 702 denotes the organic EL device as a display unit. FIG. 7C is a perspective view showing an example of a wristwatch type electronic device. In FIG.7 (c), the code | symbol 800 shows the timepiece body and the code | symbol 801 has shown the said organic EL apparatus as a display part. According to this embodiment, an electronic apparatus including a display device having excellent light emission characteristics is obtained.

  In addition, this invention is not restricted to the said embodiment, In the range which does not deviate from the summary of this invention, it can change suitably.

  For example, in the present invention, light emitted from the light emitting layer 18 is emitted from the substrate 10 side, and so-called bottom emission type organic EL device is also emitted from the sealing substrate side opposite to the substrate 10. The present invention can also be applied to a so-called top emission type organic EL device.

Sectional drawing which shows the process of the manufacturing method of the organic electroluminescent apparatus concerning this invention. Sectional drawing which shows the process of the manufacturing method of the organic electroluminescent apparatus following FIG. Sectional drawing which shows the process of the manufacturing method of the organic electroluminescent apparatus following FIG. Sectional drawing which shows the process of the manufacturing method of the organic electroluminescent apparatus following FIG. Sectional drawing which shows the process of the manufacturing method of the organic electroluminescent apparatus following FIG. Sectional drawing which shows the process of the manufacturing method of the organic electroluminescent apparatus following FIG. FIG. 14 illustrates an example of an electronic device.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Transparent electrode (anode), 15 ... Solution, 16 ... Hole injection transport layer, 17 ... Organic EL light emitting material, 18a, 18b, 18c ... Light emitting layer (organic light emitting layer), 19 ... Cathode, 100 ... Organic EL apparatus

Claims (3)

A light emitting material for an organic EL element,
An organic solvent comprising a compound having two or more cyclic structures as a solvent and at least one of the cyclic structures being a benzene ring, or a condensed ring system having at least one benzene ring structure An organic EL light-emitting material comprising an organic solvent comprising a compound. In the method of manufacturing an organic EL device having an organic light emitting layer between an anode and a cathode,
An organic solvent comprising a compound having two or more cyclic structures as a solvent and at least one of the cyclic structures being a benzene ring, or a condensed ring system having at least one benzene ring structure A method for manufacturing an organic EL device, comprising: forming an organic light emitting layer by forming an organic EL light emitting material having an organic solvent made of a compound by a droplet discharge method.   A step of forming a hole injecting and transporting layer between the anode and the organic light emitting layer, and in the step of forming the hole injecting and transporting layer, the crosslinkable material has two or more cyclic structures and Hole injection / transport layer by forming a film formed of an organic solvent composed of a compound in which at least one of the cyclic structures is a benzene ring or a solution dissolved in an organic solvent composed of a condensed ring system compound having at least one benzene ring structure The method of manufacturing an organic EL device according to claim 2, wherein:

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